Question

Water level in a well was 20m below ground level. During rainy season, rain water

collected in different water tanks was drain into the well and the water level rises 5 m

above the previous level. The wall of the well is 1m 20 cm high and a pulley is fixed at a

height of 80 cm. Raghu wants to draw water from the well. The minimum length of the

rope that he can use is:​

Answer 1

Answer:

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Answer 2

Answer:

Given :  Water level in a well was 20 m below ground level.

During rainy season , rainwater collected in different water tanks was drained in to the well and the water level rises 5 m above the previous level.

The wall of the well is 1 m 20cm high

and a pulley fixed at a height of  80 cm  

Raghu wants to draw water from the well

To Find : The minimum length of the rope ,that he can use

Solution:

Water level in a well was 20 m below ground level.

Considering below ground as - ve and above ground as +ve

Water Level = - 20 m

water level rises 5 m above the previous level.

=> New Water level = -20 + 5  = - 15 m

The wall of the well is 1 m 20cm high

and a pulley fixed at a height of  80 cm  

=> Height above ground = 1 m 20 cm + 80 cm  = 2 m  

( as 1 m = 100 cm )

Height above ground =  2 m  

Water level = - 15 m

Difference = 2 - (-15)  = 17 m

Hence minimum length of the rope is 17 m

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Step-by-step explanation: